body{font-family:Arial,sans-serif;max-width:900px;margin:40px auto;padding:20px;line-height:1.6;color:#333}
nav a{margin-right:15px}
header{background:#0D47A1;color:white;padding:20px;border-radius:8px}
.card{border:1px solid #ddd;border-radius:8px;padding:20px;margin:20px 0}
footer{margin-top:40px;color:#666;font-size:.9em}
button{background:#0D47A1;color:#fff;border:none;padding:10px 16px;border-radius:5px}